Packet drop on GRE Tunnel

nasr.khan · ‎03-07-2010

Hi

When traffic is passed via the GRE Tunnels packets are dropped.As the bandwidth are unequal I am using EIGRP
Currently running EIGRP between Tunnel routers and OSPF between VPN Router to Core. Physical links are ok, no error on interfaces.

If I run only tunnel at sales_office then no drops. load sharing is required on two tunnels. i have plugged the configuration to the post.

Once drop concern are fixed will add IPSEC to it.

please do input

nasr.khan · ‎03-08-2010

Hi

Is it possible some ios doesnt work well with EIGRP loadbalancing.

VPN router1 at DC : Version 12.4(9)T7 ( advanceEnterprise )

VPN router2 at DC : Version 12.4(9)T7 ( advanceEnterprise )

VPN router at SO : Version 12.4(24)T2 ( advanceEnterprise )

Please support

parthiban chinnaya · ‎03-09-2010

I would request you to apply the tweaks on the tunnel interface and see the results.

IP MTU 1400

IP Tcp adjust−mss 1300

There are issues with IOS .

But we need to correct the configuration part first.

In my experience I would say not to use unequal cost load balancing with GRE as it will create lot of out of order packets.

parthiban chinnaya · ‎03-09-2010

Also I am directing you to this link

https://supportforums.cisco.com/message/3030859#3030859

nasr.khan · ‎03-09-2010

Hello Parthiban

Adding these command didnt help

IP MTU 1400

IP Tcp adjust−mss 1300

when you say not to use unequal cost load balancing with GRE

what I need to eleminate from my configuration.

If unequal cost load balancing is an Know Issue then what is the other major reason to move to EIGRP over OSPF

nasr.khan · ‎03-10-2010

Hello Experts

I am still stuck on this, help please.

parthiban chinnaya · ‎03-10-2010

Hi,

What type of load balancing is running on EIGRP.

Is it per packet or per destination?

I have tested GRE over Ipsec with EIGRP ...two 100 MBPS links with per packet load balancing with 0 Drops.

nasr.khan · ‎03-10-2010

can you share your sample working config.

nasr.khan · ‎03-10-2010

Hello Netpro

What is recommended for unequal loadbalancing ( per packet / per destination ) with EIGRP

I am stuck on EIGRP part.